Experimental and Calculated Cyclic Elasto-Plastic Deformations of Copper-Based Spring Materials

Yasuhiro HATTORI; Kingo FURUKAWA; Fusahito YOSHIDA

doi:10.1587/transele.E96.C.1157

Experimental and Calculated Cyclic Elasto-Plastic Deformations of Copper-Based Spring Materials

Yasuhiro HATTORI, Kingo FURUKAWA, Fusahito YOSHIDA

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The reliability of a connector depends on the contact force generated by the spring in the terminal of a connector. The springs are commonly formed by stamping from a strip of spring material. Therefore, the prediction of the force — displacement relation by the finite element (FE) method is very important for the design of terminals. For simulation, an accurate model of stress-strain (s-s) responses of the materials is required. When the materials are deformed in the forward and then the reverse directions, almost all spring materials show different s-s responses between the two directions, due to the Bauschinger effect. This phenomenon makes simulation difficult because the s-s response depends on the prior deformation of the material. Hence, the measurement of the s-s response is the elementary process, by cyclic tension and compression testing in which materials deform elastically and plastically. Then, the s-s responses should be described accurately by mathematical models for FE simulation. In this paper, the authors compare the experimental s-s responses of copper-based materials with conventional mathematical models and the Yoshida-Uemori model, which is a constitutive model having high capability of describing the elastic and plastic behavior of cyclic deformation. The calculated s-s responses only by Yoshida-Uemori model were in very good agreement with the corresponding experimental results. Therefore, the use of this model for FE simulation would be recommended for a more accurate prediction of force-displacement relation of the spring.

Publication: IEICE TRANSACTIONS on Electronics Vol.E96-C No.9 pp.1157-1164

Publication Date: 2013/09/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1587/transele.E96.C.1157

Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electro-Mechanical Devices — Papers selected from International Session on Electro-Mechanical Devices 2012 (IS-EMD2012) and other recent research results —)

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Authors

Yasuhiro HATTORI
  AutoNetworks Technologies, Ltd.
Kingo FURUKAWA
  AutoNetworks Technologies, Ltd.
Fusahito YOSHIDA
  Hiroshima University

Keyword

spring material, stress-strain response, Bauschinger effect, Yoshida-Uemori model, FEM

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Yasuhiro HATTORI, Kingo FURUKAWA, Fusahito YOSHIDA, "Experimental and Calculated Cyclic Elasto-Plastic Deformations of Copper-Based Spring Materials" in IEICE TRANSACTIONS on Electronics, vol. E96-C, no. 9, pp. 1157-1164, September 2013, doi: 10.1587/transele.E96.C.1157.
Abstract: The reliability of a connector depends on the contact force generated by the spring in the terminal of a connector. The springs are commonly formed by stamping from a strip of spring material. Therefore, the prediction of the force — displacement relation by the finite element (FE) method is very important for the design of terminals. For simulation, an accurate model of stress-strain (s-s) responses of the materials is required. When the materials are deformed in the forward and then the reverse directions, almost all spring materials show different s-s responses between the two directions, due to the Bauschinger effect. This phenomenon makes simulation difficult because the s-s response depends on the prior deformation of the material. Hence, the measurement of the s-s response is the elementary process, by cyclic tension and compression testing in which materials deform elastically and plastically. Then, the s-s responses should be described accurately by mathematical models for FE simulation. In this paper, the authors compare the experimental s-s responses of copper-based materials with conventional mathematical models and the Yoshida-Uemori model, which is a constitutive model having high capability of describing the elastic and plastic behavior of cyclic deformation. The calculated s-s responses only by Yoshida-Uemori model were in very good agreement with the corresponding experimental results. Therefore, the use of this model for FE simulation would be recommended for a more accurate prediction of force-displacement relation of the spring.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E96.C.1157/_p

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@ARTICLE{e96-c_9_1157,
author={Yasuhiro HATTORI, Kingo FURUKAWA, Fusahito YOSHIDA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Experimental and Calculated Cyclic Elasto-Plastic Deformations of Copper-Based Spring Materials},
year={2013},
volume={E96-C},
number={9},
pages={1157-1164},
abstract={The reliability of a connector depends on the contact force generated by the spring in the terminal of a connector. The springs are commonly formed by stamping from a strip of spring material. Therefore, the prediction of the force — displacement relation by the finite element (FE) method is very important for the design of terminals. For simulation, an accurate model of stress-strain (s-s) responses of the materials is required. When the materials are deformed in the forward and then the reverse directions, almost all spring materials show different s-s responses between the two directions, due to the Bauschinger effect. This phenomenon makes simulation difficult because the s-s response depends on the prior deformation of the material. Hence, the measurement of the s-s response is the elementary process, by cyclic tension and compression testing in which materials deform elastically and plastically. Then, the s-s responses should be described accurately by mathematical models for FE simulation. In this paper, the authors compare the experimental s-s responses of copper-based materials with conventional mathematical models and the Yoshida-Uemori model, which is a constitutive model having high capability of describing the elastic and plastic behavior of cyclic deformation. The calculated s-s responses only by Yoshida-Uemori model were in very good agreement with the corresponding experimental results. Therefore, the use of this model for FE simulation would be recommended for a more accurate prediction of force-displacement relation of the spring.},
keywords={},
doi={10.1587/transele.E96.C.1157},
ISSN={1745-1353},
month={September},}

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TY - JOUR
TI - Experimental and Calculated Cyclic Elasto-Plastic Deformations of Copper-Based Spring Materials
T2 - IEICE TRANSACTIONS on Electronics
SP - 1157
EP - 1164
AU - Yasuhiro HATTORI
AU - Kingo FURUKAWA
AU - Fusahito YOSHIDA
PY - 2013
DO - 10.1587/transele.E96.C.1157
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E96-C
IS - 9
JA - IEICE TRANSACTIONS on Electronics
Y1 - September 2013
AB - The reliability of a connector depends on the contact force generated by the spring in the terminal of a connector. The springs are commonly formed by stamping from a strip of spring material. Therefore, the prediction of the force — displacement relation by the finite element (FE) method is very important for the design of terminals. For simulation, an accurate model of stress-strain (s-s) responses of the materials is required. When the materials are deformed in the forward and then the reverse directions, almost all spring materials show different s-s responses between the two directions, due to the Bauschinger effect. This phenomenon makes simulation difficult because the s-s response depends on the prior deformation of the material. Hence, the measurement of the s-s response is the elementary process, by cyclic tension and compression testing in which materials deform elastically and plastically. Then, the s-s responses should be described accurately by mathematical models for FE simulation. In this paper, the authors compare the experimental s-s responses of copper-based materials with conventional mathematical models and the Yoshida-Uemori model, which is a constitutive model having high capability of describing the elastic and plastic behavior of cyclic deformation. The calculated s-s responses only by Yoshida-Uemori model were in very good agreement with the corresponding experimental results. Therefore, the use of this model for FE simulation would be recommended for a more accurate prediction of force-displacement relation of the spring.
ER -